benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 u15a, 2003-09-15,  CHS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022602,  NONE, 1.3652, 1.4129, 30, 14420
 u15a, 2003-09-16,  CHS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022602,  NONE, 1.3652, 1.4129, 30, 10
 u15a U15A_1995_NGS, 2007-09-20,  JMS ,  USGS ,  ASHTECH,  LP019992809 ,  Z-XII 1L00,  ASH701945B_M,  CR519993703,  NONE, 1.4035, 1.4508, 30, 30
 u15a U15A_1995_NGS, 2007-09-21,  JMS ,  USGS ,  ASHTECH,  LP019992809 ,  Z-XII 1L00,  ASH701945B_M,  CR519993703,  NONE, 1.4035, 1.4508, 30, 30
 u15a U15A_1995_NGS, 2015-09-20,  SAH ,  USGS ,  ASHTECH,  ZE1200411029 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 1.3137, 1.3619, 15, 152415